Texas Instruments Corporation

Julie Marie Nirchi

Suzanne Mary Vining

Win Naing Maung

Douglas Edward Wente

In some examples, an apparatus includes a circuit configured to receive communication on a first bus. The circuit is also configured to provide the communication on a second bus for a first period of time. The circuit is also configured to monitor a duration of the providing of the communication on the second bus. The circuit is also configured to, responsive to the duration exceeding a threshold amount, stop providing the communication on the second bus for a second period of time.

Repeater babble detection

Data communication devices, e.g., eUSB2 repeaters, include a partial bit filter to filter out a partial bit so it is not transmitted. The partial bit filter includes state-detection-and-hold circuitry having first and second differential signal inputs, a first output and a second output; logic circuitry having a first input coupled to the first output of the state-detection-and hold circuitry, and a second input coupled to the second output of the state-detection-and hold circuitry; and filter circuitry coupled to the logic circuitry and having a control output. The filter circuitry may be implemented as a latch or a network of flip flops. The output control signal of the partial bit filter may be applied to a transmitter in an eUSB2 repeater or to a pass-gate at the output of the transmitter.

Partial bit filter for usb interface

In an example, a data communication device includes one or more receivers, and one or more transmitters. The data communication device detects a start of frame packet (&#x3bc;SOF) on a data bus, wherein the &#x3bc;SOF indicates the start of a microframe; determines whether there are any data packets contained in the microframe during a first threshold period after the &#x3bc;SOF; and detects that there is no data packet contained in the microframe during the first threshold period after the &#x3bc;SOF, and in response, transitions at least one of the one or more transmitters from an active state to an OFF state, and transitions the at least one of the one or more transmitters from the OFF state to the active state prior to a switchback period before the end of the microframe.

Power consumption reduction in USB redrivers and repeaters

A method includes detecting a micro start of frame packet (&#x3bc;SOF) on a data bus. If there is at least one data packet contained in a microframe during the first threshold period after the &#x3bc;SOF, transmitters are held in an active state. If there is no data packet in the first threshold period after the &#x3bc;SOF, the transmitters are transitioned from the active state to an OFF state. The method also includes transitioning the transmitters from the OFF state to the active state prior to a switchback period before the end of the microframe. The method also includes transitioning the transmitters from the OFF state to the active state if a data packet is received in the OFF state. The method also includes dropping the data packet received in the OFF state and transitioning from the OFF state to the active state when the data packet is dropped.

Power consumption reduction in USB 2.0 redriver and in eUSB2 repeater

A method of operating an embedded USB2 (eUSB2) repeater includes receiving a downstream packet at a USB2 port and transitioning a USB transmitter from an idle state to a standby state responsive to receiving the downstream packet. The method further includes transitioning the USB transmitter from the standby state to an active state if an upstream packet is received at an eUSB2 port within a first time period of receiving the downstream packet and transmitting the upstream packet. The method also includes transitioning the USB transmitter from the active state to the standby state after transmission of the upstream packet. The method also includes transitioning the USB transmitter from the standby state to the idle state if more upstream packets are not received at the eUSB2 port within a second time period.

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Allen, TX, United States of America

Julie Marie Nirchi